Joint metal fitting and column joint structure

Abstract

To provide a joint metal fitting that can be manufactured more simply and more cost-effectively while maintaining stable quality, and a column joint structure utilizing the joint metal fitting.SOLUTION: A joint metal fitting 10 according to one embodiment of the present invention comprises: a column side plate portion 12 fixed to a column leg portion 102 by joining a column 100 to a foundation 200; a fixed portion side plate portion 14 fixed to the foundation 200; and a connection portion 16 extending vertically between the column side plate portion 12 and the fixed portion side plate portion 14 and connected to each of the column side plate portion 12 and the fixed portion side plate portion 14. The connection portion 16 is hollow in shape. In the column side plate portion 12 and the fixed portion side plate portion 14, through holes 20, 22 continuous with the interior of the connection portion 16 are respectively formed, and the joint metal fitting consists of a cast piece in which the column side plate portion 12, the fixed portion side plate portion 14 and the connection portion 16 are integrated.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a metal joint used to join members, and more particularly to a metal joint that joins a column to a fixing part that is spaced apart from the column in the vertical direction.The present invention relates to a column joint structure using a metal joint. [Background technology]

[0002] In a building, when a column is to be joined to a member (hereinafter referred to as a fixed part) that is a predetermined distance away from the column, for example, the end of the column and the fixed part are fastened to a metal joint that is arranged between the column and the fixed part. An example of the metal joint is the metal joint described in Patent Document 1.

[0003] The connecting hardware described in Patent Document 1 is a column base hardware that connects the lower end (column base) of a column of a load-bearing wall to the foundation, and has an upper plate that is fixed to the column base, a lower plate that is fixed to the foundation, and a connecting leg that connects the upper and lower plates and has a cross-shaped cross section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-111917 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional metal joints are generally constructed by combining multiple parts and joining them together by welding or other methods. Therefore, until now, using metal joints required work such as assembly and welding, which was burdensome and time-consuming. Furthermore, the quality of these tasks (work precision) can depend on the skill and proficiency of the worker. Therefore, there has been a demand for metal joints that can be manufactured more easily while maintaining stable quality. Furthermore, from a cost perspective, it is desirable to be able to provide metal joints that are less expensive.

[0006] Therefore, the present invention has been made in consideration of the above problems, and its purpose is to provide a metal joint that can be manufactured more simply and inexpensively while maintaining stable quality. Another object of the present invention is to provide a column joint structure in which a column is joined to a fixed portion by the above-mentioned metal joint. [Means for solving the problem]

[0007] The above-mentioned problems are solved by the joining hardware of the present invention, which is a joining hardware that joins a column to a fixed part that is separated from the column in the vertical direction, and has a column side plate part that is fixed to the end of the column, a fixed part side plate part that is fixed to the fixed part, and a connecting part that extends in the vertical direction between the column side plate part and the fixed part side plate part and is connected to each of the column side plate part and the fixed part side plate part, the connecting part being hollow, and each of the column side plate part and the fixed part side plate part having a through hole that is continuous with the interior of the connecting part, and the column side plate part, the fixed part side plate part and the connecting part being formed as a cast product in which the column side plate part, the fixed part side plate part and the connecting part are integrated. The metal joint of the present invention having the above-mentioned characteristics can be manufactured more simply and inexpensively while maintaining stable quality.

[0008] Furthermore, regarding a more preferred configuration of the joining metal fittings of the present invention, the connecting portion preferably has a cylindrical wall, a pair of first protrusions protruding from the cylindrical wall in opposite directions in a first direction, and a pair of second protrusions protruding from the cylindrical wall in opposite directions in a second direction intersecting the first direction. With the above configuration, a metal joint can be realized that can be manufactured more simply and inexpensively while ensuring the strength required to join the pillar to the fixed part.

[0009] Furthermore, to describe an even more preferable configuration for the joining metal fittings of the present invention, the cross section of the cylindrical wall has a shape made up of four or more connected arc segments, and each of the four or more arc segments is curved so as to be convex toward the central axis of the cylindrical wall. With the above configuration, by increasing the rigidity of the cylindrical wall, the strength of the metal joint required to join the pillar to the fixed portion can be further improved.

[0010] Furthermore, regarding the metal joint of the present invention, a more preferable configuration is that the protruding amount of each of the first protruding portion and the second protruding portion increases as they approach the fixed portion side plate portion. With the above configuration, by giving the first protrusion and the second protrusion appropriate shapes, the strength of the joining metal fittings required to join the pillar to the fixing portion can be further improved.

[0011] Furthermore, the aforementioned problem is solved by the column joint structure of the present invention in that the joining hardware of the present invention is positioned between the column and a fixed part spaced apart from the column in the vertical direction, and the column is joined to the fixed part by fixing the joining hardware to both the column and the fixed part. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a metal joint that can be manufactured more simply and inexpensively while maintaining stable quality, and a column joint structure using the metal joint. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a column joint structure according to one embodiment of the present invention; [Figure 2] 1 is a perspective view of a metal joint according to one embodiment of the present invention. FIG. [Figure 3] FIG. 1 is a side view of a metal joint according to one embodiment of the present invention. [Figure 4] FIG. 1 is a top view of a metal joint according to one embodiment of the present invention. [Figure 5] FIG. 2 is a bottom view of a metal joint according to one embodiment of the present invention. [Figure 6] FIG. 4 is a cross-sectional view of FIG. 3 taken along line AA. [Figure 7] FIG. 4 is a view showing a cross section BB of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] <<About one embodiment of the present invention>> Hereinafter, a metal joint and a column joint structure according to one embodiment of the present invention (hereinafter referred to as this embodiment) will be described with reference to the accompanying Figs.

[0015] In this specification, unless otherwise specified, the position, orientation, and posture of each part of the metal joint described below refer to the position, orientation, and posture when the metal joint is in use. For example, the upper (lower) side of the metal joint means the upper (lower) side when viewed from the metal joint in use, i.e., when the metal joint is joining the column to the fixed part. In this specification, the up and down direction refers to the vertical direction.

[0016] In this specification, unless otherwise specified, a "cross section" refers to a cross section perpendicular to the up-down direction. Furthermore, in this specification, "horizontal," "vertical," "orthogonal," and "parallel" include the range of error generally accepted in the technical field of the present invention, and also include states where the state is deviated from strictly horizontal, vertical, orthogonal, and parallel within a range of less than a few degrees (e.g., 2 to 3 degrees).

[0017] The connecting hardware according to this embodiment (hereinafter referred to as connecting hardware 10) is a component used to construct buildings such as houses, and connects the end of a column inside the building to a fixed part that is a predetermined distance away from the column in the vertical direction. That is, by connecting the column to the fixed part using connecting hardware 10, a column connection structure is constructed inside the building. Examples of columns include partition walls and columns of bearing walls. Examples of fixed parts include foundations, support members that support the first floor, and beams that support the floors of upper floors in multi-story buildings. In the following, a specific example will be described in which the column is a column of a bearing wall and the fixed part is a foundation. That is, in this embodiment, as shown in Fig. 1, a metal joint 10 that joins a column 100 of a bearing wall 110 to a foundation 200, and a column joint structure S using the metal joint 10 will be described.

[0018] The column joint structure S of this embodiment is constructed by placing a connecting metal fitting 10 between the lower end (hereinafter referred to as the column base 102) of the column 100 of the load-bearing wall 110 and the foundation 200 in the vertical direction, as shown in Figure 1, and fixing the connecting metal fitting 10 to the column base 102 and the foundation 200. The shear wall 110 is made of a known shear wall, and has a structure in which a diagonal member 104 (brace) is spanned between a pair of columns 100 spaced apart horizontally, as shown in Figure 1.

[0019] As shown in Figures 2 and 3, the connecting hardware 10 has a column side plate portion 12, a fixing portion side plate portion 14, and a connecting portion 16. The column side plate portion 12 is a flat plate the upper surface of which is fixed to the column base portion 102, more specifically, to the lower end surface of the column 100, and in this embodiment, has a rectangular planar shape as shown in Figure 4. The means for fixing the column side plate portion 12 to the column base portion 102 is not particularly limited, and may be, for example, fastening with bolts or joining by welding.

[0020] The fixed portion side plate 14 is a flat plate placed on the upper surface of the foundation 200 and fixed to the foundation 200, and in this embodiment has a rectangular planar shape as shown in Fig. 5. As shown in Fig. 5 and other figures, the fixed portion side plate 14 is provided with bolt holes 18, and the fixed portion side plate 14 is fixed to the foundation 200 by anchor bolts 202 inserted into the bolt holes 18 (see Fig. 1). The planar size of the fixed part side plate portion 14 is slightly larger than the planar size of the column side plate portion 12, and the thickness of the fixed part side plate portion 14 is thicker than the thickness of the column side plate portion 12. Also, as shown in Figure 3, in the connecting metal fitting 10, the column side plate portion 12 and the fixed part side plate portion 14 are arranged vertically spaced apart, with the centers of each plate portion (the intersection of diagonals in a plan view) positioned coaxially.

[0021] 4 and 5, a through hole is provided in the center of each of the column side plate portion 12 and the fixed portion side plate portion 14. The shape of this through hole is not particularly limited, but it is preferable that it has the same shape as the outer shape of the cylindrical wall 24 of the connecting portion 16, which will be described later. Hereinafter, the through hole provided in the column side plate portion 12 will be referred to as the upper through hole 20, and the through hole provided in the fixed portion side plate portion 14 will be referred to as the lower through hole 22.

[0022] 2 and 3, the connecting portion 16 extends in the vertical direction between the lower surface of the column side plate portion 12 and the upper surface of the fixed portion side plate portion 14, and is connected to both the column side plate portion 12 and the fixed portion side plate portion 14. In this embodiment, as shown in FIGS. 6 and 7, the connecting portion 16 has a hollow shape; in other words, each portion of the connecting portion 16 has a closed cross-sectional structure. More specifically, as shown in FIGS. 6 and 7, the connecting portion 16 has a cylindrical wall 24 that forms the main part of the connecting portion 16, a pair of first protrusions 32 protruding outward from the cylindrical wall 24, and a pair of second protrusions 34 protruding outward from portions of the cylindrical wall 24 that are different from the first protrusions 32.

[0023] The cylindrical wall 24 extends from the lower surface of the column side plate portion 12 to the upper surface of the fixed portion side plate portion 14, and the cross-sectional shape and size (area) of each portion of the cylindrical wall 24 are the same throughout the entire cylindrical wall 24. As shown in FIGS. 6 and 7 , the cross-section of each portion of the cylindrical wall 24 has a shape in which four or more arc portions 26 are connected in the circumferential direction (outer circumferential direction) of the cylindrical wall 24. In this embodiment, the cross-section of each portion of the cylindrical wall 24 is made up of four arc portions 26. However, this is not limited thereto, and the cross-section of each portion of the cylindrical wall 24 may be made up of five or more arc portions 26, and preferably is made up of 4×n arc portions 26 (n is a natural number).

[0024] Each of the four arcuate portions 26 is curved in an arcuate shape, specifically, as shown in Figures 6 and 7, it is curved so as to be convex toward the central axis 28 of the cylindrical wall 24. In other words, the cross section of each portion of the cylindrical wall 24 is star-shaped (star-pointed), and its edge line forms an asteroid curve.

[0025] Furthermore, the inside of the hollow cylindrical wall 24 (hereinafter referred to as the "tube interior") is continuous with the upper through-hole 20 and the lower through-hole 22. In other words, the tube interior is connected to the space outside the metal joint 10 through the upper through-hole 20 and the lower through-hole 22.

[0026] 6 and 7, the pair of first protrusions 32 are portions that protrude in opposite directions from the cylindrical wall 24 in the first direction. Also, as shown in Figs. 6 and 7, the pair of second protrusions 34 are portions that protrude in opposite directions from the cylindrical wall 24 in the second direction.

[0027] 6 and 7, in this embodiment, the first protrusion 32 and the second protrusion 34 each protrude from the top of the cylindrical wall 24. In other words, the cross section of each part of the connecting portion 16 is generally cross-shaped with a hollowed-out center. A connecting portion 16 having such a shape has fewer internal corners than, for example, a connecting portion having a cross-shaped cross section formed by two plate pieces intersecting each other at right angles. This makes it less likely for liquid to pool during electrodeposition coating, and allows for coating with reduced unevenness.

[0028] The first direction is the direction in which two diagonally opposite apexes of the four apexes of the cylindrical wall 24 are aligned, and the second direction is a direction intersecting the first direction, more specifically, a direction perpendicular to the first direction. In other words, when the cylindrical wall 24 is viewed from directly above, of two imaginary planes that divide the cylindrical wall 24 into four equal parts and intersect in a crisscross shape, the extension direction of one plane corresponds to the first direction, and the extension direction of the other plane corresponds to the second direction. The apexes of the cylindrical wall 24 are the portions where the ends of two adjacent arc portions 26 in the cylindrical wall 24 are joined. In addition, in FIGS. 6 and 7, the first direction and the second direction are respectively indicated by arrows.

[0029] Each of the pair of first protrusions 32 and each of the pair of second protrusions 34 are rib-shaped pieces. That is, each of the first protrusions 32 and the second protrusions 34 functions as a reinforcing rib that reinforces the cylindrical wall 24. Furthermore, each of the first protrusions 32 and the second protrusions 34 has a substantially triangular outer shape when viewed from the side (see FIG. 3). In other words, the protrusion amount of each of the first protrusions 32 and the second protrusions 34 gradually increases as they approach the fixed portion side plate portion 14. This shape can further enhance the reinforcing effect provided by providing the first protrusions 32 and the second protrusions 34.

[0030] The metal joint 10 of this embodiment is constructed by a casting in which the column side plate portion 12, the fixed portion side plate portion 14, and the connecting portion 16 are integrated together. That is, the column side plate portion 12, the fixed portion side plate portion 14, and the connecting portion 16 are integrally formed by casting, and adjacent portions of the metal joint 10 are connected seamlessly (without joints).

[0031] When the metal joint 10 is formed by casting, for example, molten metal is poured into a mold (not shown) and hardened in the mold to form a cast (i.e., the metal joint 10), and then the cast is removed from the mold. At this time, holes are provided at the ends of the cast (the upper and lower ends of the metal joint 10) to allow the mold to be removed, and these holes correspond to the upper through-hole 20 and the lower through-hole 22 in the metal joint 10.

[0032] The metal that is the material of the metal joint 10, which is a cast product, is not particularly limited, but for example, cast iron, cast steel, heat-resistant alloy steel, etc. can be used as the material of the metal joint 10.

[0033] The connecting hardware 10 described above has stable quality as a hardware for connecting the base 102 of the column 100 of the bearing wall 110 to the foundation 200. Furthermore, the connecting hardware 10 can be manufactured more simply and inexpensively than conventional connecting hardware. Specifically, conventional column base hardware for connecting a column base to a foundation has, for example, a column side plate fixed to the column base, a fixed side plate fixed to the foundation, and a connecting portion connecting these plates vertically. Such connecting hardware may be made by combining multiple components. In other words, at construction sites where connecting hardware is used, the components that make up the connecting hardware must be joined together by welding or other means, which requires a lot of work and effort. Furthermore, the quality and precision of this work depend on the skill and proficiency of the worker, and may also affect the position of bolt holes into which anchor bolts are inserted to secure the connecting hardware to the foundation.

[0034] In contrast, the metal joint 10 of this embodiment is formed by casting, and therefore does not require welding, assembly, or other processes as with conventional metal joints. Furthermore, the quality of the metal joint 10 as a final product is stable, enabling the production of products (metal joints) that meet rated specifications. As a result, problems such as changes in the quality of the metal joint, specifically the position of the bolt holes 18, due to the precision of welding, assembly, and other processes, can be avoided, and construction using the metal joint 10 can be carried out appropriately.

[0035] Furthermore, in conventional metal joints, the cross section of the connecting part is cross-shaped in order to ensure the strength (joint strength) required to connect the column base and the foundation. Therefore, it is preferable that the connecting part of a metal joint made of a casting also has a cross-shaped cross section or a cross section equivalent to that. On the other hand, when constructing a metal joint by casting, it is necessary to minimize material costs and reduce manufacturing costs.

[0036] In the connecting hardware 10 of this embodiment, the connecting portion 16 has a generally cross-shaped cross section in which the first protrusion 32 and the second protrusion 34 protrude from the top of the hollow cylindrical wall 24. This ensures joint strength while reducing material costs by the amount that the inside of the cylindrical wall 24 (i.e., the inside of the cylinder) is hollow. In addition, the column side plate portion 12 and the fixing portion side plate portion 14 each have through holes (upper through hole 20 and lower through hole 22) that are continuous with the inside of the cylinder. These through holes are holes that are used when removing the casting from the mold at the end of casting, and the provision of these through holes further reduces material costs.

[0037] When the column base 102 is connected to the foundation 200 by the connecting metal fitting 10, if an external load such as an earthquake load is input to the column 100 (more specifically, the shear wall 110), most of the load will be transmitted to the diagonal member 104, while the input load to the connecting metal fitting 10 will be relatively small. Therefore, even if the connecting metal fitting 10 is made of a cast product, it can adequately withstand the input load, and the connection state between the column base 102 and the foundation 200 can be stably maintained.

[0038] <<Other embodiments>> While one embodiment of the metal joint and column joint structure of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit and scope of the present invention. Furthermore, the present invention naturally includes equivalents thereof.

[0039] In the above embodiment, the column connection structure S in which the column base 102 is connected to the foundation 200 by the connecting metal fittings 10 has been described as an example, but the present invention is not limited to this. The connecting metal fittings of the present invention can also be used, for example, when connecting the upper end of a column (column capital) to a fixed part located above it, specifically, a beam or the like that supports the floor of the upper floor. [Explanation of symbols]

[0040] 10 Metal joints 12 Column side plate 14 Fixed part side plate part 16 Connecting part 18 bolt holes 20 Upper through hole 22 Lower through hole 24 Cylindrical wall 26 Arc section 28 Center axis 32 1st protrusion 34 Second protrusion 100 pillars 102 Column base (column end) 104 Diagonal 110 Load-bearing wall 200 Foundation (fixed part) 202 Anchor bolt S-column joint structure

Claims

1. A metal joint that joins a pillar to a fixing part that is separated from the pillar in the vertical direction, A pillar side plate portion fixed to an end portion of the pillar; a fixed portion side plate portion fixed to the fixed portion; a connecting portion extending in the up-down direction between the column side plate portion and the fixed portion side plate portion and connected to each of the column side plate portion and the fixed portion side plate portion, The connecting portion has a hollow shape, a through hole communicating with the interior of the connecting portion is formed in each of the column side plate portion and the fixing portion side plate portion; A joining hardware constructed from a casting in which the column side plate portion, the fixed portion side plate portion, and the connecting portion are integrated.

2. The connecting portion of the metal joint described in claim 1 has a cylindrical wall, a pair of first protrusions protruding from the cylindrical wall in opposite directions in a first direction, and a pair of second protrusions protruding from the cylindrical wall in opposite directions in a second direction intersecting the first direction.

3. a cross section of the cylindrical wall having a shape in which four or more arc segments are connected; The metal joint according to claim 2 , wherein each of the four or more arc portions is curved convexly toward the central axis of the cylindrical wall.

4. The metal joint according to claim 2 , wherein the protruding amounts of the first protruding portion and the second protruding portion increase as they approach the fixed portion side plate portion.

5. A column joint structure in which the connecting metal fitting described in any one of claims 1 to 4 is arranged in the vertical direction between a column and a fixed part spaced from the column, and the column is joined to the fixed part by fixing the connecting metal fitting to each of the column and the fixed part.

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